/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMBlueprint.h
Allow each blueprint instance to add specific UBlueprintNodeSpawners pertaining to the sub-class type. Serves as an extensible way for new nodes, and game module nodes to add themselves to context menus.
virtual void GetInstanceActions ( [FBlueprintActionDatabaseRegistrar](API\Editor\BlueprintGraph\FBlueprintActionDatabaseRegistra-) & ActionRegistrar ) const